15533309 divided by 215 
The aim is to understand the frequency of 215 in 15533309.

Let's proceed to step 1:
When dividing 1 by 215, we get 0 with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Grab the next digit (5) from the dividend, add it to 1, then carry on: 15 / 215

Advancing to step 2:
15 divided by 215 is 0 with a remainder of 15.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 15 after subtracting 0 from 15.
Bring next digit (5) of the dividend behind the 15 and repeat the process: 155 / 215

Step 3:
The number 215 fits into 155 0 times, leaving a remainder of 155.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 155 to get 155.
Append the next digit (3) from the dividend to 155 and continue with: 1553 / 215

On to step 4:
215 can be fit into 1553 7 times, resulting in a remainder of 48.
Write down 7 as next digit of the result. 
Result so far: 7.0
If we subtract 1505 from 1553, we get 48.
Grab the next digit (3) from the dividend, add it to 48, then carry on: 483 / 215

Moving on to step 5:
215 can be fit into 483 2 times, resulting in a remainder of 53.
The number 2 becomes the next digit in our result. 
Result so far: 72.0
Subtracting 430 from 483 leaves us with 53.
Bring next digit (3) of the dividend behind the 53 and repeat the process: 533 / 215

Going ahead to step 6:
The number 215 fits into 533 2 times, leaving a remainder of 103.
Record the quotient 2 as the next digit in the result. 
Result so far: 722.0
Subtract 430 from 533 to get 103.
Bring next digit (0) of the dividend behind the 103 and repeat the process: 1030 / 215

Advancing to step 7:
The number 215 fits into 1030 4 times, leaving a remainder of 170.
Write down 4 as next digit of the result. 
Result so far: 7224.0
Subtracting 860 from 1030 leaves us with 170.
Take the next digit (9) from the dividend and append it to 170, then repeat: 1709 / 215

Going ahead to step 8:
The number 215 fits into 1709 7 times, leaving a remainder of 204.
Put 7 as the next digit of the answer. 
Result so far: 72247.0
If we subtract 1505 from 1709, we get 204.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2040, and continue the process.

Step 9:
When dividing 2040 by 215, we get 9 with a remainder of 105.
The next digit of our result is 9. 
Result so far: 72247.9
If we subtract 1935 from 2040, we get 105.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1050, and continue the process.

Moving on to step 10:
When dividing 1050 by 215, we get 4 with a remainder of 190.
The next digit of our result is 4. 
Result so far: 72247.94
If we take 860 away from 1050, we end up with 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1900, and continue the process.

Moving on to step 11:
When dividing 1900 by 215, we get 8 with a remainder of 180.
Record the quotient 8 as the next digit in the result. 
Result so far: 72247.948
If we take 1720 away from 1900, we end up with 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Going ahead to step 12:
215 goes into 1800 8 times with a remainder of 80.
Record the quotient 8 as the next digit in the result. 
Result so far: 72247.9488
If we take 1720 away from 1800, we end up with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

The final result is 72247.9488 with a remainder of 0.0008.